i have never seen tea length mermaid dress before, i thought all mermaid dress are floor length as it flares out at the bottom bit. if you are looking for custom made dresses, you can have a look at 7foxmall.com. have bought dresses there, love the dress and affordable.

@llovrich: Maybe if you got a dress that flares out higher on the leg (fit & flare is i think what you want to search for?) you could just have the skirt shortened & scrunched on one side. seems like do-able alterations